OREAS 188

OREAS 188 is a nickel laterite certified reference material prepared from a blend of predominantly saprolitic nickel-bearing ores and weathered basaltic material. The lateritic ores were sourced mainly from Barro Alto, Brazil, with lesser contributions from Ravensthorpe, Murrin Murrin, and Bulong, Western Australia.

Twenty-eight commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Borate Fusion XRF- Majors and some traces, including Loss on Ignition (LOI) at 1000 °C
  • Lithium borate or sodium peroxide fusion with full suite elemental package by ICP-OES and/or MS finish
  • Carbon and sulphur by infrared combustion furnace/CS analyser

Homogeneity was evaluated using 12 subsamples analysed by lithium borate fusion with X-ray fluorescence finish. ANOVA was applied to duplicates from six test units to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Ni, Nickel (wt.%) 1.64 0.029 1.62 1.66 Borate Fusion XRF
Co, Cobalt (ppm) 328 11 317 339 Borate Fusion XRF
Sc, Scandium (ppm) 12.3 1.9 10.7 13.9 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 5.28 0.080 5.22 5.33 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 2.63 0.046 2.60 2.66 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (wt.%) 0.646 0.016 0.634 0.658 Borate Fusion XRF
Cu, Copper (ppm) 80 13 66 94 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 15.90 0.196 15.77 16.03 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.194 0.010 0.182 0.205 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 18.78 0.162 18.62 18.94 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.238 0.004 0.232 0.244 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.702 0.027 0.679 0.725 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.075 0.004 0.071 0.079 Borate Fusion XRF
Pb, Lead (ppm) < 50 IND IND IND Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 42.74 0.333 42.47 43.02 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.756 0.053 0.711 0.800 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.464 0.010 0.453 0.475 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 129 13 99 158 Borate Fusion XRF
Zn, Zinc (ppm) 110 9 99 120 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 10.02 0.396 9.76 10.28 Thermogravimetry
Al, Aluminium (wt.%) 2.77 0.077 2.69 2.84 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 105 5 100 110 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 1.86 0.079 1.78 1.94 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 19.4 0.75 18.5 20.2 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 331 14 319 344 Borate / Peroxide Fusion ICP
Cr, Chromium (wt.%) 0.441 0.021 0.427 0.454 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.42 0.07 0.29 0.55 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 75 13 63 86 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 1.65 0.18 1.50 1.80 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 0.87 0.10 0.77 0.97 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.55 0.030 0.51 0.59 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 10.93 0.393 10.65 11.21 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 6.32 0.74 5.49 7.16 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 1.89 0.23 1.67 2.12 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.31 0.04 0.26 0.35 Borate / Peroxide Fusion ICP
In, Indium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.175 0.023 0.152 0.198 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 8.93 0.531 8.40 9.47 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 6.31 1.56 4.91 7.72 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.11 0.01 0.09 0.13 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 11.22 0.265 10.96 11.48 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.182 0.010 0.176 0.188 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 6.51 0.582 5.49 7.53 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 4.77 0.273 4.31 5.22 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 8.71 0.485 8.30 9.12 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.61 0.047 1.57 1.65 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.032 0.003 0.030 0.034 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) < 100 IND IND IND Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 2.14 0.180 1.97 2.31 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 6.47 0.615 5.75 7.20 Borate / Peroxide Fusion ICP
Re, Rhenium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.311 0.012 0.297 0.325 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 4.48 0.52 3.78 5.17 Borate / Peroxide Fusion ICP
Se, Selenium (ppm) < 20.0 IND IND IND Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 20.21 0.536 19.75 20.66 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 1.98 0.073 1.83 2.13 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 102 5 98 106 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.28 0.012 0.26 0.31 Borate / Peroxide Fusion ICP
Te, Tellurium (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 1.67 0.18 1.49 1.84 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.272 0.010 0.263 0.282 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.12 0.02 0.09 0.15 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 0.53 0.08 0.42 0.65 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 68 5.6 64 72 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 1.59 0.29 1.32 1.86 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 8.08 0.425 7.66 8.50 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 0.85 0.074 0.78 0.93 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 109 11 98 121 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 44.5 5.2 38.4 50.6 Borate / Peroxide Fusion ICP
C, Carbon (wt.%) 0.736 0.033 0.711 0.760 Infrared Combustion
S, Sulphur (wt.%) 0.294 0.014 0.283 0.305 Infrared Combustion
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